Not sure if this has been discussed, but suppose the guitar
Jacob gave to Hurley acts in the same manner as Richard's/Locke's
compass. When Hurley is flashed forward 30 years at the end of
Season 5*, the guitar flies through time and lands where Charlie
finds it via John Locke in Season 1. When Charlie dies/815ers
scatter due to Kahana, his guitar is taken by Jacob and delivered
to Hurley at the prison to only go back in time again, pushing
Charlie and Hurley to get back on their intended paths at their
respective points in time...the guitar being a physical catalyst
for course correction...

Think of this as an offshoot of that other frank blog but did
any one think he might be there to replace Richard??

Just a thought, maybe Jacob knew Richard would fail him, let him
die, and make someone else (pilot of a plane/Richard as possible
Black Rock captain) the righthand man to the leader with eternal
youth.

The latin text on the Blast Door Map would suggest that somebody
working on it was a hostile, plus the fact alot of the other text
seemed to indicated a lack of knowledge about D.I. Being higher up
than Dr. Chang indicates Radzinsky knew all of the DI operations,
so he didn't need query the stations (unless after the incident, he
was removed from the circle of trust, and many more stations were
built while he was stuck in The Swan or maybe the writers just
really fucked up the continuity of the BDM,and the man known as
Radzinsky back then wasn't the #2 Dharma man he is Season 5) So
maybe Kelvin was a hostile and wrote that stuff after Radzinsky
died? There was also something written on the BDM that questioned
trusting Kelvin...

1. Michael Keaton (either as himself or just him playing the
character of Jacob but adlibbing the entire time)so technically
still Jack and stays true to producer's word that he hasn't
been cast yet. 2. Arvin Sloane. He knows more than anyone and swaps
sides all the time. 3. Initially Ian Hart, but changes every
season, was Kenneth Brannagh at some stage - possibly season 3? 4.
A lonely war widow, overprotective of her children and is waiting
for Christopher Eccleston to come home but Eloise Hawking knows the
truth 5. Greg Grunberg. Just thought there wasn't nearly enough G's
in this blog.